Restructuring - Summary of Aggregated Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 8,779	$ 14,843	$ 5,404
Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	5,956	2,256	3,190
Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,823	$ 12,587	$ 2,214